Self-luminous marker for screw heads and nail heads



A. V. T. DAY.

SELF LUMINOUS MARKER FOR SCREW HEADS AND NAIL HEADS.

APPLICATION FILED SEPT,24, I918. 1,420,185, PatentedJune 20, 1922.

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Specification of Letters Tatent. P m m J 2Q 1922 Application filed september 24, 1918. Serial No. 255,558.

T 0 all whom it may concern:

Be it known that T, ALBERT V. T. DAY, a citizen of the United States, and residing at New Rochelle, county of Westchester, State of New York, have conceived certain new and useful Inventions Embodied in the Self- Luminous Markers for Screw Heads and Nail Heads, 'set forth in the following specification and illustrated in the accompanying drawings.

This invention consists in self-luminous .markers for screw heads and nail heads and like objects, designed to facilitate the visual location thereof in the dark. For instance,

it may be employed to mark one or more of the screw heads which retain the outer flush plates of the familiar electric wall switch, so that the switch-actuating buttons may readily be found by their positions relative to the marked screw or screws; and likewise the invention may be used on the escutcheon plates of keyholes, or on various other fixtures and devices. It is sought to provide means of this character which shall be simple, cheap and durable.

Four adaptations of the invention are illustrated in the accompanying drawings in which:

Figures 1, 2, 3 and 4 are sectional views of different forms of the invention applied to screw heads, the section planes being taken in the axis of the screws; and

Figure 5 is a plan view of the screw and its self-luminous marker shown in Figure 4.

The device of Figure 1 consists in a hollow conical celluloid shell 8 which fits the countersink under the head of the screw 6 and is extended into a downward flare 9 forming an annular chamber 10 in which is contained a self-luminous body such as a self-luminous paint applied and hardened within the groove 10 before the device is applied to the screw head. When the device is in place the self-luminous paint is protected in front by the celluloid sheet and in rear by the plate 7 of the wall switch, or whatever surface the screw enters.

The device of Figure 2 comprises a base ring of conjoined conical, flat and cylindrical parts, 11, 12 and 13; and a transparent cover ring, for instance celluloid, with conical and annular-arch parts, 14 and '15, which fit over the base ring to form an annular chamber 16 with a transparent wall 15. The chamber 16 may be filled with self-luminous material in loose powder form which is generally more luminous for a given cost, than the paint. The base and cover rings may be cemented together. The base ring may be of metal and may have a light-reflecting surface to reflect incident rays from the powder back through the mass thereof, which will generally be translucent.

The device of Figure 3 is for a flat headed screw 18, in lieu of the countersunk screws of all the other figures. The flat base-ring 19 has an upstanding cylindrical flange 20 which encircles the outer wall of the annular arch 22 of the celluloid top ring, whose fiat part 21 is cemented onto the base ring. The arch 22 forms the chamber 23 containing the self-luminous powder. The outer juncture between the two rings may also be cemented, and the base ring may act as a light-reflector.

The device of Figure 4 is for marking a screw which sets close to a protruding angle or object, such as a sliding switch but-ton The conical base ring 24 and celluloid ring 26 fit under the countersunk screw head, and are eccentrically extended into fiat flanges 25 and 28, the upper or transparent flange 28 having a raised arch 27 forming a powder-containing chamber 29 of approximately crescent formation on one side of the screw head only.

The invention is of course applicable not only toscrew and nails, but also to bolts,

rivets, pins, and all manner of like objects,

and comprehends all adaptations within the definitions of the following claims:

1. A self-luminous marker for a screw or nail or like object, comprising a base ring fitting under the head of the object and having a lateral extension, a transparent facing sheet secured over said lateral extensioruand self-luminous material secured between said extension of the base ring and the said transparent sheet.

2. A self-luminous marker for a screw or.

nail or like object, comprising a base rin and a superposed transparent ring, adapte to be clamped together beneath the head of the object and to project laterally therefrom, and self-luminous material secured between the laterally projecting parts of said rings.

In testimony whereof, I have afiixed my signature to this specification.

ALBERT V. T. DAY. 

